For one extreme example, kids born with Prader-Willi syndrome feel the need to eat constantly, a drive that can make them dangerously and profoundly overweight.

用个极端的例子说明：患有普拉德·威利综合征的孩子总有旺盛食欲，把他们推向重度肥胖的危险境地。

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Duplication of others stretches of DNA in humans are implicated in the development disorders spinal muscular atrophy and Prader-Willi syndrome.

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